參數(shù)資料
型號(hào)： LDA08B
廠(chǎng)商： National Semiconductor Corporation
英文描述： 265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mode
中文描述： 在3.3V電源音頻功率放大器265mW的關(guān)斷模式
文件頁(yè)數(shù)： 15/19頁(yè)
文件大?。?/td> 772K
代理商： LDA08B
Application Information
(Continued)
(5)
R
F
/R
i
= A
VD
/2
(6)
From Equation 5, the minimum A
VD
is 1.55; use A
VD
= 2.
Since the desired input impedance was 20 k
, and with a
A
VD
of 2, a ratio of 1:1 of R
to R
results in an allocation of
R
= R
= 20 k
. The final design step is to address the
bandwidth requirements which must be stated as a pair of
3 dB frequency points. Five times away from a pole gives
0.17 dB down from passband response which is better than
the required
±
0.25 dB specified.
f
L
= 100Hz/5 = 20Hz
f
H
= 20kHz x 5 = 100kHz
As stated in the
External Components
section, R
i
in con-
junction with C
i
create a highpass filter.
C
i
≥
1/(2
π
*
20 k
*
20 Hz) = 0.397μF;
The high frequency pole is determined by the product of the
desired high frequency pole, f
, and the differential gain,
A
. With a A
= 2 and f
= 100kHz, the resulting GBWP
= 100kHz which is much smaller than the LM4900 GBWP of
25MHz. This figure displays that if a designer has a need to
design an amplifier with a higher differential gain, the
LM4900 can still be used without running into bandwidth
problems.
use 0.39μF
L
www.national.com
15
相關(guān)PDF資料
PDF描述
LDA10B 1W, Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain
LDC08A 3W Audio Power Amplifier with Shutdown Mode
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LDO514 IP Library: High PSRR, Very Low power, 200mA Low Dropout Voltage Regulator
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